JPS6440913A - Compact zoom lens - Google Patents
Compact zoom lensInfo
- Publication number
- JPS6440913A JPS6440913A JP19836987A JP19836987A JPS6440913A JP S6440913 A JPS6440913 A JP S6440913A JP 19836987 A JP19836987 A JP 19836987A JP 19836987 A JP19836987 A JP 19836987A JP S6440913 A JPS6440913 A JP S6440913A
- Authority
- JP
- Japan
- Prior art keywords
- group
- lens
- negative
- positive
- serves
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
PURPOSE:To obtain a large-diameter, high-performance zoom lens although it is of lightweight, compact, and simple constitution by composing a 1st group of one negative lens element formed by cementing a negative and a positive lens together and satisfying specific conditions. CONSTITUTION:This lens system consists of three negative, positive, and positive groups I-III. In zooming operation, while the image plane position of the 1st group I is held constant, the 1st group I and 2nd group II move, the 2nd group II serves for power variation, and the 3rd group III is fixed and serves for image formation. Here, the 1st group I is composed of one cemented lens of one negative lens and one positive lens and satisfies an inequality I. Here, psiI and psiII are refracting power values of the 1st and 2nd groups, fw the composite focal length at the wide-angle end, R the radius of curvature, DELTAnu the difference between the Abbe number of the negative lens the Abbe number of the positive lens in the 1st group. Consequently, the zoom lens which has a large diameter, but is short in overall length and small in weight is composed of a small number of elements and high performance is obtained over the entire zoom range.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62198369A JP2556046B2 (en) | 1987-08-07 | 1987-08-07 | Compact zoom lens |
US07/230,173 US5009491A (en) | 1987-08-07 | 1988-08-08 | Compact zoom lens system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62198369A JP2556046B2 (en) | 1987-08-07 | 1987-08-07 | Compact zoom lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6440913A true JPS6440913A (en) | 1989-02-13 |
JP2556046B2 JP2556046B2 (en) | 1996-11-20 |
Family
ID=16389963
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62198369A Expired - Lifetime JP2556046B2 (en) | 1987-08-07 | 1987-08-07 | Compact zoom lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2556046B2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6349002B1 (en) | 1999-04-27 | 2002-02-19 | Nikon Corporation | Variable focal length lens system and imaging apparatus equipped with thereof |
JP2005308953A (en) * | 2004-04-20 | 2005-11-04 | Konica Minolta Opto Inc | Variable power optical system, image pickup lens device and digital apparatus |
JP2006039182A (en) * | 2004-07-27 | 2006-02-09 | Konica Minolta Photo Imaging Inc | Imaging apparatus |
JP2008058600A (en) * | 2006-08-31 | 2008-03-13 | Canon Inc | Zoom lens and imaging apparatus having the same |
US7474472B2 (en) | 2006-06-06 | 2009-01-06 | Olympus Imaging Corp. | Zoom lens, and imaging system comprising the same |
US8411378B2 (en) | 2009-10-07 | 2013-04-02 | Olympus Imaging Corp. | Zoom lens and image pickup apparatus equipped with same |
-
1987
- 1987-08-07 JP JP62198369A patent/JP2556046B2/en not_active Expired - Lifetime
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6349002B1 (en) | 1999-04-27 | 2002-02-19 | Nikon Corporation | Variable focal length lens system and imaging apparatus equipped with thereof |
JP2005308953A (en) * | 2004-04-20 | 2005-11-04 | Konica Minolta Opto Inc | Variable power optical system, image pickup lens device and digital apparatus |
JP2006039182A (en) * | 2004-07-27 | 2006-02-09 | Konica Minolta Photo Imaging Inc | Imaging apparatus |
US7474472B2 (en) | 2006-06-06 | 2009-01-06 | Olympus Imaging Corp. | Zoom lens, and imaging system comprising the same |
JP2008058600A (en) * | 2006-08-31 | 2008-03-13 | Canon Inc | Zoom lens and imaging apparatus having the same |
US8411378B2 (en) | 2009-10-07 | 2013-04-02 | Olympus Imaging Corp. | Zoom lens and image pickup apparatus equipped with same |
Also Published As
Publication number | Publication date |
---|---|
JP2556046B2 (en) | 1996-11-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |